Did well interviewing and was prepared for offer. Got shutdown later when I tried to negotiate salary. Problem seemed to be a really testy program manager, wasn't even nice about denying it.

I was initially interviewed for a position and was told that I did not have the skillset. They dragged telling me out as well. They suddenly called me back and told me sorry for the back and forth but that the position had changed and that they felt that I would be a great fit. I was interviewed again and they told me that I had the position...even giving me a conditional offer letter. They had me fill out plenty of paperwork and then emailed all of my references which I thought was very weird. After that, they came back and said that they apologized but that they had decided to fill the position internally. They really went out of their way to bring my hopes up and then drop me like I meant nothing. Be careful!